MACS Service Reports - 2015 - DEC8
ing and understanding cross systems integration
will have paid off when you've arrived at a conclusion. Whether the repair is a new compressor, HVAC
head or software update, make sure you avoid the
haste of skipping an importing detail of your repair
by following all the details for the particular job. Everything from software relearns after programming to
burnishing a new compressor clutch can be as critical
as the rest of the repair operation. Finally, the same
systems performance test, road test and OBD-II drive
cycle that you performed in the initial diagnosis needs
to be ran again to verify the vehicle is fixed for good
and the customer is ready for the good news . . . a
quality repair fixed right the first time! ■
The Power of Reason
Formula for Calculating Frequency
F = 1/T with F standing for Frequency and T standing for
Time / Period.
MACS
Dave Hobbs
From reading the VW diagram, we know:
1. The span of the duty cycle, and
2. The period duration.
Therefore, we can conclude a couple of things. First, if you
do not have a lab scope you could elect to put your DMM
into action if it has a frequency / duty cycle function. Knowing
the duration of the period also gives us the frequency of the
sensor. Observing that the duration is 20 mS, we can then
calculate the frequency at which this sensor turns on and off.
How is that calculated, you ask? It's simple!
Figure 10: To command compressor displacement, tools like the ECCS06
Electrical Control Compressor System Scanner are available.
MACS Service Reports is published monthly by the Mobile Air Conditioning Society Worldwide. It is distributed to members of MACS Worldwide
and is intended for the educational use of members of the automotive air
conditioning service and repair industry. Suggestions for articles will be
considered for publication, however, MACS Worldwide reserves the right
to choose and edit all submissions.
Editors:
Elvis Hoffpauir, Steve Schaeber
Production Designer:
Laina Casey
Manager of Service Training:
Steve Schaeber
Mobile Air Conditioning Society Worldwide
P.O. Box 88, Lansdale, PA 19446
Phone: (215) 631-7020 * Fax: (215) 631-7017
Email: membership@macsw.org * Website: www.macsw.org
Unless otherwise noted, all photos/art by author.
December 2015
8
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